Offline first Using service workers, after coffee break, Yaay!

_offlinefirst.js

(coffee break).then( freshMind => {
    self.addEventListener('fetch', function (event) {
        // TODO: respond with an entry from the cache if there is one.
        // If there isn't, fetch from the network.    
        event.respondWith(
            caches.open('wittr-static-v1').then(cache => {
                return cache.match(event.request).then(response => {
                    if (!response) {
                        return fetch(event.request);
                    }
                    return response;
                });
            })
        );
    });
})